A facile strategy to fabricate an intumescent fire-retardant coating with improved fire resistance and water tolerance f
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A facile strategy to fabricate an intumescent fire-retardant coating with improved fire resistance and water tolerance for steel structure Siqi Huo, Cheng Wang, Qinghua Hu, Shi Liu, Qi Zhang, Zhitian Liu
Ó American Coatings Association 2020 Abstract An intumescent fire-retardant coating (IFRC) with improved fire resistance and water tolerance was prepared in this work, resulting from the introduction of microcapsuled ammonium polyphosphate (MFAPP) and zinc borate (MFBZ). The asprepared coating exhibited great fire resistance and smoke suppression. In the cone calorimetry test, adding only 6 wt% MFBZ dramatically reduced the peak heat release rate, total heat release, and total smoke release by 23.4%, 54.7%, and 81.1%, respectively. In addition, the water resistance and
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11998-020-00360-1) contains supplementary material, which is available to authorized users. S. Huo, C. Wang, Q. Hu, S. Liu, Q. Zhang (&), Z. Liu (&) Institute of Materials for Optoelectronics and New Energy, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, Hubei, People’s Republic of China e-mail: [email protected] Z. Liu e-mail: [email protected]
thermal stability of the coatings were also characterized. The char yield of IFRC noticeably increased to 41.7%, indicating good high-temperature stability. Besides, the IFRC showed a water contact angle of 90.1° and maintained good structure and fire resistance after being soaked by water, indicating great water resistance. The enhanced performance portfolio was mainly due to the synergistic effects of ammonium polyphosphate, pentaerythritol, melamine, and zinc borate, and the hydrophobicity of melamine–formaldehyde resin (MF). This work offers an effective approach for the preparation of waterborne intumescent fire-retardant coatings with great fire resistance and water tolerance.
J. Coat. Technol. Res.
Graphic abstract
Keywords Microencapsulation, Intumescent fire-retardant coatings, Fire resistance, Thermal stability, Water tolerance
Introduction The steel structure is an important part of a building due to its high strength-to-weight ratio, simple and convenient manufacture, and good plastic toughness.1–4 Although steel is one kind of non-combustible material, its strength and elastic coefficient will dramatically decrease in the fire, and its strength and hardness will be completely lost when the temperature increases to 600°C.5–6 Therefore, it is necessary to take measures to protect the steel structure from collapsing in a fire.7 Nowadays, intumescent fire-retardant coatings are regarded as one of the most practical methods to provide passive fire protection to the structural steel.8 Intumescent fire-retardant coatings mainly consist of polymer binders, intumescent flame retardant (IFR), and other additives.9–11 The traditional IFR is comprised of three parts, namely carbon source (e.g. pentaerythritol),12,13 acid source (e.g., ammonium polyphospha
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